Synthesis and luminescence characterization of rare earth ion doped lithium yttrium borate phosphors

Rare earth ions doped lithium yttrium borate phosphors were synthesized by conventional solid-state synthesis method at 560 C for 5 h, at 660 C for 5 h 750 C for 2h. Thermoluminescence (TL) glow curves of the synthesized phosphors doped with 1 mole % dysprosium (Dy), terbium (Tb) and neodymium (Nd) ions was carried out using Harshaw 3500 TLD reader. TL properties of the phosphors were examined after exposure X ray, UV, beta irradiation. The dysprosium doped lithium yttrium borate phosphor display glow curves having peaks at around 190 and 260 C after beta irradiation, 105 and 190C after X -ray irradiation and 105 and 220 C after 254 nm UV irradiation. The neodymium doped lithium yttrium borate phosphor shows glow curves having peaks at around 130 and 200 C after beta irradiation, 165 and 235C after X -ray irradiation and 100, 270 and 360 C after 254 nm UV irradiation. Moreover, TL glow curves terbium doped lithium yttrium borate phosphor exhibits TL glow peaks at about 145 and 220C after beta irradiation, 150 and 230C after X -ray irradiation and 110 and 275 C after 254 nm UV irradiation. The prominent electronic transitions corresponding to Li6Y(BO3)3 phosphors doped Tb, Nd and Dy rare earth ions were monitored in the PL spectrum. Li6Y(BO3)3:Dy phosphor displayed photoluminescence emissions with dominating transitions at 4F9/26Hj (j=15/2, 13/2, 11/2 and 9/2). The photoluminescence emission spectrum of terbium doped Li6Y(BO3)3: phosphors showed that the series of intense and prevailing emission-state belonging to 5D47Fj (j=6, 4 and 3), corresponding to the typical 4f4f transitions of Tb3+. The emission spectrum of Li6Y(BO3)3:Nd phosphor involves of profiles mainly located in the red spectral area corresponding to transition from the excited the 5D0 state to 7Fj (j=0, l, 2, 3 and 4) levels of 4f6 configuration of Nd3+. The synthesized new lithium yttrium borate phosphors could be taken over an appropriate host for rare-earth ion doped because of having sharp emission characteristics.